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Cellular Respiration
Chapter 9
Textbook Pages 220-239
Study Guide Pages 70-76
Looking Ahead…Today: Begin Cellular RespirationTomorrow: Glycolysis/FermentationFriday: Open notes quiz
Short class (due to assembly) Start work on Krebs cycleMonday: No SchoolTuesday: Finish Krebs cycle and electron
transportWednesday:Compare/Contrast Photosynthesis
and Cell Resp.Thurs & Fri: You’ll have a sub.
Who/What needs food?
PeopleAnimalsPlantsBacteriaFungiAll living things
Energy comes from Sugars (or complex starches)…
One gram of sugar can produce 3811 calories of heat energy
1000 calories of heat energy = 1 kilocalorie (labeled as Calorie with a capital “C” on our food products)
Pulling Energy from Sugar
How do organisms get energy from sugar?
Cellular Respiration!Occurs in the mitochondrionBegins with glycolysisFood is broken down in the presence of
oxygen!
What is Cellular Respiration?
The process that releases energy by breaking down food molecules in the presence of oxygen
6O2 + C6H12O6 6CO2 + 6H2O + energy
Oxygen + glucose carbon dioxide + water + energy
Steps of Cellular Respiration
Glycolysis (cytoplasm)
Krebs Cycle (mitochondria)
Electron Transport Chain (mitochondria)
Cell Resp.
Project…
Use the Handout to cut out the stages of Cellular Respiration.
Paste cycle on a piece of paper to put in your binder
Label cytoplasm and mitochondrionAdd arrowsMake it colorful and fun!
Daily Warm Up…The three stages of cellular respiration, in
order, are _________, ________, and __________.
The equation for cellular respiration is ___ + ___ _____ + _____ + ______
What are the reactants?What are the products?HOTS: Cellular respiration is called aerobic
respiration because _________ must be present as the final acceptor of electrons.
HOTS Higher Order Thinking Skills
HOTS: Cellular respiration is called aerobic respiration because oxygen must be present as the final acceptor of electrons.
**When you’re doing aerobics, you breathe more rapidly, because you need more oxygen!!**
GlycolysisProcess in which one molecule of glucose is
broken in half, producing 2 molecules of pyruvic acid
Using the jumper cables…
In order to get things going, 2 ATP molecules are used to “jump start” the glycolysis process
Once things get rolling…
Making energy…
Glycolysis can produce 4 ATP molecules and 2 NADH molecules
NADH works just like NADPH… think of it as the prison transport van… Each NAD+ can transport 2 high-energy
electrons, or “prisoners” and one H+ ion, or “prison guard”
Faster than driving on the Autobahn…
Glycolysis moves super fast…So fast, in fact, that the cell can produce
thousands of ATP molecules in just a few miliseconds!
Fermentation No oxygen around? Cells then rely on fermentation to release
energy from food. No oxygen = anaerobic NADH is converted to NAD+ by giving the 2 electrons and H+
ion to the pyruvic acid
2 Types of Fermentation:
Alcoholic fermentationYeast (bread)Some microorganismsPyruvic acid + NADH alcohol + CO2 + NAD+
Lactic acid fermentationWhy your muscles burn
sometimes when you exercisePyruvic acid + NADH lactic acid + NAD+